Campbell 21X Instrukcja Operatora Pobierz pdf (Strona 87)

06

't4

22

30

38

05

13

21

29

37

m

11

19

27

35

01

09

17

25

33

110

v(w1)

CV(W1,e1)

v(w2)

DAY

v(u1)

cR(w1,u1)

v(u2)

M(u1)

V(e1)

M(U2)

V(e2)

SECTION

8.

PROCESSING

AND PROGRAM

CONTROL

EXAMPLES

TABLE

8.7'4.

Thirty

Minute

Output

From

Example

M(V1)

07

MCrai)

08

cv(w1,u1)

1s

cv(wl,vl)

16

M(V2)

m

MCra2)

24

cv(w2,u2)

31

CV(W2,V2)

32

,v2')

CV(U2,Ta2)

36

HRMIN

04

MWl)

V(V1)

12 Vfial)

cR(wr,v1)

20

M(w2)

V(V2)

28

v[az)

M(el)

CV(W1,Ta1)

M(e2)

CV(W2,Ta2)

and

8.8-3

respectively.

A

portion

of

the

power

spectra

results

are

illustrated

in

Figure 8.8-2.

The

phase

of

the cosine

wave

that

describes

the

signat

atthe

beginning

of

the

firsl

interval and

the endof

the

last

intervalcan

be determined

by

looking

at the

21X

program

flable

5) that

generated

the

"originaltime

series

data".

The

1.25H2

signalbegan

and

ended

at27O

degrees.

[cos

270

=

cos(O

-

90)

=

sin 0].

The

O-ZStlzsignalbegan

at27O

degrees

and

ended

at

126

degrees.

The

phases ofthe 1.25

and

0.25

signals

are27O

and

198

respectively

fl-able

8.8-2).

FFT ANALYSIS

OF

0.25

AND

1 .25 Hz SIGNAL

o.9

,,^ 0,6

3i

--

i

o.r

6t

<3

o.a

ol

o.7

o7

d o.rcsu

o.J96a

o$596

o.7ol26

o976

l.r7192

IJ6724

FntMKl

rN

h

=

6rS

O

TO

150

FIGURE

8.8-2.

FFT

Power

Spectra

Analysis

of

0.25

and

1.25

Hz Signal

8.8'

FAST

FOURIER

TRANSFORM

EXAMPLES

8.8.1.

BIN

AVERAGING

The

21X was

to

generate

data

representing

two

superimposed

sine

wave

signals,

one

4

1.25H2

(amplitude_= 1) and

the

shows

a

plot

Sf

the

simulated

signal.

Th

was

applied

t{

the

data

and

the

real and

imaginary,

phpse

and

magnitude,

and th

spectra

result$

are

shown

in

Tables

8.8-

other

at 0.25

Hz

(amplitude

=

2).

The

1024

generated

simulate

a samPling

rate

of

iO

Hz or a 0.'l

second

scan

rale.

Figure

8.8-1

shows

a

plot

Sf

the

simulated

signal.

The

FFT

imaginary,

phpse

and

magnitude,

and the

power

speitra

resuftt

are

shown

in

Tables

8.8-1,

8.8-2,

FIGURE 8.&1.

Simulated

1.25

and

O.25Hz

Signals

&11

1 2 ... 82 83 84 85 86 87 88 89 90 91 92 ... 190 191

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